"A podcast is an MP3 file that can be put on any portable
MP3 player and listened to away from your computer.
You can also listen to a podcast on your computer."

A lullaby "is a soothing piece of music, usually played or sung to young children before they go to sleep, with the intention of aiding that process. As a result, the music is often simple and repetitive. Lullabies can be found in many countries, and have existed since ancient times.[1] Tonally, most lullabies are simple, often merely alternating tonic and dominant harmonies."(Wikipedia)

The term nursery rhyme "is used for traditional poems and songs for young children in Britain and many other countries, but usage only dates from the late 18th/early 19th century and in North America the term "Mother Goose Rhymes", introduced in the mid-1700s, is still often used.[1]"(Wikipedia)

Sodcasting "is described by The Urban Dictionary as "The act of playing music through the speaker on a mobile phone, usually on public transport.
Commonly practised by young people wearing polyester, branded sportswear with dubious musical taste."(BBC)

Music- a lesson proposed by Randall S. Davis with : - a list of commonly-used vocabulary with a recording of the
words in RealMedia format.
- a short quiz to test students' comprehension of some
of the words,
- a Follow-Up exercise for expanding students' use
of the vocabulary in a conversation with a partner or group.(esl-lab)